diff --git a/frontend-modern/browser-tests/reverse-proxy-help.cjs b/frontend-modern/browser-tests/reverse-proxy-help.cjs
new file mode 100644
index 0000000000..cfd6292286
--- /dev/null
+++ b/frontend-modern/browser-tests/reverse-proxy-help.cjs
@@ -0,0 +1,120 @@
+// Real shipped Docs/router/CSS, with no backend, proxy or real credential.
+const assert = require('node:assert/strict');
+const fs = require('node:fs');
+const path = require('node:path');
+const { createHash } = require('node:crypto');
+const { chromium, webkit } = require('playwright');
+
+(async () => {
+  const workspace = process.cwd();
+  const root = path.join(workspace, 'frontend-modern');
+  const output = path.join(workspace, 'tmp', 'reverse-proxy-help');
+  fs.mkdirSync(output, { recursive: true });
+  const binding = JSON.parse(fs.readFileSync(path.join(output, 'binding.json'), 'utf8'));
+  assert.match(binding.sourceSha, /^[0-9a-f]{40}$/);
+  for (const [file, digest] of Object.entries(binding.contentSha256)) {
+    assert.equal(
+      createHash('sha256').update(fs.readFileSync(path.join(workspace, file))).digest('hex'),
+      digest,
+      file,
+    );
+  }
+  process.chdir(root);
+  const { createServer } = await import(path.join(root, 'node_modules/vite/dist/node/index.js'));
+  const server = await createServer({
+    root,
+    configFile: path.join(root, 'vite.config.ts'),
+    cacheDir: path.join(root, 'node_modules', '.vite-reverse-proxy-help'),
+    server: { host: '127.0.0.1', port: 5268, strictPort: true },
+    optimizeDeps: { noDiscovery: true, include: [] },
+  });
+  const observations = [];
+  let browser;
+  const inViewport = (id) => {
+    const heading = document.getElementById(id);
+    return heading && heading.getBoundingClientRect().top >= 0 &&
+      heading.getBoundingClientRect().top < innerHeight;
+  };
+  try {
+    await server.listen();
+    for (const [engine, width, height, tone] of [
+      ['chromium', 1280, 1000, 'light'], ['webkit', 390, 844, 'dark'],
+    ]) {
+      browser = await { chromium, webkit }[engine].launch(engine === 'chromium'
+        ? { headless: true, channel: 'chromium', args: ['--no-sandbox'] }
+        : { headless: true });
+      const page = await browser.newPage({
+        viewport: { width, height },
+        ...(engine === 'webkit' ? { isMobile: true, hasTouch: true } : {}),
+      });
+      const errors = [];
+      page.on('pageerror', (error) => errors.push(error.message));
+      page.on('console', (message) => {
+        if (message.type() === 'error') errors.push(message.text());
+      });
+      await page.goto('http://127.0.0.1:5268/browser-tests/docs-fragment-navigation.html');
+      if (tone === 'dark') await page.evaluate(() => document.documentElement.classList.add('dark'));
+      await page.getByRole('link', { name: '← All documentation' }).click();
+      const entry = page.locator('a[data-doc-link][href="/docs/REVERSE_PROXY"]').first();
+      await entry.focus();
+      await page.keyboard.press('Enter');
+      const heading = page.locator('#before-configuring-the-proxy');
+      await heading.waitFor();
+      await heading.scrollIntoViewIfNeeded();
+      let text = await page.locator('article').innerText();
+      for (const phrase of [
+        'configured immediate peer', 'PULSE_TRUSTED_PROXY_CIDRS=127.0.0.1/32',
+        'Wildcard ranges', 'rejected at startup', 'not an authentication bypass',
+        'Adding the header alone is not sufficient',
+      ]) assert.ok(text.includes(phrase), phrase);
+      assert.ok(await page.evaluate(() => document.documentElement.scrollWidth <= innerWidth + 1));
+      await page.screenshot({ path: path.join(output, `${engine}-trust.png`) });
+      const nginx = page.locator('pre').filter({ hasText: 'proxy_set_header X-Forwarded-For $remote_addr;' });
+      await nginx.scrollIntoViewIfNeeded();
+      const copied = await nginx.innerText();
+      assert.ok(copied.includes('proxy_set_header X-Forwarded-Proto $scheme;'));
+      assert.ok(copied.includes('proxy_set_header Forwarded "";'));
+      assert.ok(!copied.includes('$proxy_add_x_forwarded_for'));
+      assert.ok(await page.evaluate(() => document.documentElement.scrollWidth <= innerWidth + 1));
+      await page.screenshot({ path: path.join(output, `${engine}-nginx.png`) });
+      const configuration = page.getByRole('link', { name: 'configuration overrides', exact: true });
+      await configuration.focus();
+      await page.keyboard.press('Enter');
+      await page.waitForFunction(inViewport, 'common-overrides-environment-variables');
+      text = await page.locator('article').innerText();
+      assert.ok(text.includes('forwarded client IP, scheme, host and port'));
+      const back = page.getByRole('link', { name: 'Reverse Proxy', exact: true });
+      await back.focus();
+      await page.keyboard.press('Enter');
+      await page.waitForFunction(inViewport, 'before-configuring-the-proxy');
+      assert.ok(page.url().endsWith('/docs/REVERSE_PROXY#before-configuring-the-proxy'));
+      const authentication = page.getByRole('link', { name: 'proxy authentication guide', exact: true });
+      await authentication.focus();
+      await page.keyboard.press('Enter');
+      await page.waitForFunction(inViewport, '-header-trust-boundary');
+      assert.ok(page.url().endsWith('/docs/PROXY_AUTH#-header-trust-boundary'));
+      assert.ok((await page.locator('article').innerText()).includes('never append to them'));
+      assert.deepEqual(errors, []);
+      observations.push({
+        engine, width, height, tone, browserVersion: browser.version(),
+        trustWarningRendered: true, safeNginxBlockRendered: true,
+        keyboardConfigurationRoundTrip: true, keyboardAuthenticationBoundary: true,
+        noPageOverflow: true, errors,
+      });
+      await browser.close();
+      browser = undefined;
+    }
+    const result = {
+      result: 'passed', playwrightVersion: require('playwright/package.json').version,
+      sourceSha: binding.sourceSha, verifiedAt: new Date().toISOString(),
+      contentSha256: binding.contentSha256, dependencySnapshot: binding.dependencySnapshot,
+      scope: 'Production Docs rendering/navigation; not native proxy configuration, TLS or SSO acceptance',
+      observations,
+    };
+    fs.writeFileSync(path.join(output, 'result.json'), JSON.stringify(result, null, 2) + '\n');
+    console.log(JSON.stringify(result));
+  } finally {
+    if (browser) await browser.close();
+    await server.close();
+  }
+})().catch((error) => { console.error(error); process.exitCode = 1; });